When malsensing occurs, a pacemaker may send impulses to the heart during the relaxation phase. What condition may the patient experience if malsensing occurs in a ventricular pacemaker?

_____ prevent blood in the heart from flowing backward from the ventricles into the atria

a. Valves b. Veins c. Arteries d. Coronary sulcus

Which of the following types of roof coverings are noncombustible but may be ignitable if embers are blown underneath?

A. Slate tiles B. Asphalt shingles C. Wood roof shakes D. Metal roof coverings